11
ASSEMBLY STEP 3
Fasten the T-Rail to the Motor Unit
• Place the opener on packing material to protect the cover. For
convenience, put a support under the chain sprocket bracket.
• Remove the two 5/16"-18x1/2" washered bolts mounted in the
top of the motor unit.
• Align the holes in the back section of the T-rail with the holes in
the motor unit.
• Fasten the rail with the two washered bolts previously removed.
Tighten securely. Remember to use only these bolts! Any
other bolts will cause serious damage to the opener.
• Insert a 5/16"-18x7/8" hex bolt into the cover protection bolt
hole in the T-rail as shown. Tighten securely with a 5/16" lock
washer and nut.
NOTE: This bolt prevents trolley over-travel. Keep a 25 mm
minimum between the trolley and this bolt when adjusting travel
limits (see page 28).
• Attach chain spreader with #8x1" hex screws and washers as
shown.
Nut
5/16"-18
Lock Washer
5/16"
Hex Bolt
5/16"-18x7/8"
HARDWARE SHOWN ACTUAL SIZE
To avoid SERIOUS damage to opener, ONLY use bolts/
fasteners mounted in top of motor unit.
Nut
5/16"-18
#8x1"
Hex Screws
Chain
Spreader
USE ONLY THIS
TYPE AND SIZE
BOLT
Cover
Protection
Bolt Hole
Rail
(Back
Section)
Lock Washer
5/16"
Hex Bolt
5/16"-18x7/8"
Washers
Washered Bolt
5/16"-18x1/2"
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